A short-process technology for enhanced separation of ilmenite

Abstract

This invention relates to a short-process technology for enhanced separation of ilmenite, belonging to the field of mineral processing technology. The process includes three steps: (1) performing a roughing and scavenging flotation operation on the ilmenite feed material to obtain ilmenite flotation concentrate and flotation tailings; (2) performing acid pretreatment on the ilmenite flotation concentrate, followed by solid-liquid separation to obtain acid-pretreated ilmenite concentrate; and (3) performing a high-gradient strong magnetic separation roughing operation on the acid-pretreated ilmenite concentrate to obtain the final ilmenite concentrate. The process structure of this invention is simple and efficient. In the ilmenite beneficiation process, the addition of acid pretreatment can reduce heterogeneous agglomeration between ilmenite and gangue mineral particles, and the use of high-gradient strong magnetic separation can enhance the efficient collection of ilmenite, obtaining high-grade and high-recovery titanium concentrate, which fully solves the technical problem of the difficulty in recovering fine-grained ilmenite.

Description

Technical Field

[0001] This invention belongs to the field of mineral sorting and comprehensive utilization technology, specifically relating to a short-process technology for enhanced sorting of ilmenite. Background Technology

[0002] my country possesses relatively abundant titanium resources, but primary ilmenite reserves account for about 97% of the total titanium resources, mainly occurring in vanadium-titanium magnetite deposits. For these ores, the general principle of "iron first, then titanium" is adopted. However, due to limitations in iron ore development and titanium beneficiation technology, the overall recovery rate of titanium resources is only about 22%, resulting in a low comprehensive utilization rate and a serious waste of titanium resources.

[0003] Titanium resources in the Panzhihua-Xichang region of my country are hosted in basic to ultrabasic rock bodies, with complex ore compositions. The titanium-beneficiating materials often contain titanium- and iron-containing silicate gangue minerals such as pyroxene, chlorite, feldspar, sphene, and olivine. The exposed elements on their surfaces are very similar to those on the surface of ilmenite, and these gangue minerals are prone to mud formation, resulting in poor selectivity of flotation reagents and severe mechanical inclusions, further increasing the difficulty of ilmenite beneficiation. Currently, titanium beneficiation processes generally suffer from problems such as lengthy beneficiation procedures, high consumption of flotation reagents, difficulty in controlling concentrate grade, and low recovery rates. Xu Xinbang et al., targeting ilmenite material with a TiO2 grade of 11.03%, adopted a "high-intensity magnetic separation-flotation" process, with a flotation flow of "one roughing, four cleaning, and one scavenging" step, obtaining a titanium concentrate with a TiO2 grade of 47.31% and a recovery rate of 61.65%. Deng Bing et al. conducted a titanium beneficiation study on vanadium-titanium magnetite ore in the Panzhihua-Xichang region. They adopted a process of pre-enrichment through strong magnetic separation followed by flotation. The flotation process employed a "one-stage roughing, four-stage cleaning, and one-stage scavenging" flow, achieving a TiO2 grade of 47.78% and an operational recovery rate of 61.25% for the obtained titanium concentrate. Yang Yaohui et al. conducted a combined process of strong magnetic separation and flotation for thickened overflow ore from a company in Sichuan. The flotation process employed a one-stage roughing, one-stage scavenging, six-stage cleaning, and middlings centralized treatment and re-selection flow, combined with a self-developed dispersant. The resulting titanium concentrate achieved a TiO2 grade of 47.41% and an operational flotation recovery rate of 73.21%. Therefore, improving the separation efficiency of ilmenite in the process flow is of great significance for increasing the overall recovery rate of ilmenite.

[0004] In previous research, invention patent CN111744677 B described adding an acid pretreatment process before ilmenite beneficiation. This process can amplify the difference in flotation properties between ilmenite and silicate gangue minerals. Essentially, the dissolution rate of metal ions on the surface of gangue minerals is higher than that of ilmenite. Acid treatment facilitates the desorption of the hydrophobic film on the surface of gangue minerals. Therefore, acid treatment weakens the heterogeneous agglomeration between ilmenite and gangue minerals, effectively cleaning and strengthening the dispersion of ilmenite agglomerates. This contributes to efficient separation of ilmenite during the beneficiation process. Therefore, this invention provides a short-process technology for enhanced ilmenite separation. After surface acid treatment, the flotation concentrate is precisely collected using a strong magnetic field to improve the ilmenite separation and recovery rate. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a short-process technology for enhanced ilmenite separation. The method employs acid pretreatment to surface-treat the ilmenite flotation concentrate, which reduces the heterogeneous agglomeration of induced hydrophobic ilmenite and silicate gangue mineral particles while promoting homogeneous agglomeration of ilmenite. This significantly improves ilmenite separation efficiency. This invention is a separation method with a simple process structure and high ilmenite recovery rate.

[0006] A short-process technology for enhanced separation of ilmenite includes the following steps:

[0007] (1) Ilmenite flotation

[0008] The ilmenite material to be floated is prepared into a slurry with a mass concentration of 30-40%, and flotation reagents are added to carry out the ilmenite flotation process. The flotation process includes one roughing operation and one scavenging operation. The roughing concentrate is the ilmenite flotation concentrate, the scavenging tailings are the flotation tailings, and the scavenging concentrate is returned to the ilmenite roughing operation.

[0009] (2) Acid pretreatment of ilmenite flotation concentrate

[0010] The ilmenite flotation concentrate is subjected to acid pretreatment, followed by solid-liquid separation to obtain ilmenite acid pretreated concentrate.

[0011] (3) High-intensity magnetic separation of ilmenite acid pretreated concentrate

[0012] The acid pretreated concentrate of ilmenite is subjected to a high gradient magnetic separation process, which includes a roughing operation. The roughing concentrate is the final concentrate of ilmenite, and the tailings are returned as middlings to the flotation roughing operation in step (1).

[0013] Furthermore, in step (1), the particle size of the ilmenite flotation material is more than 80% -0.075mm, so as to ensure that the ilmenite and gangue minerals are fully liberated, or to ensure that the individual ilmenite particles and the rich intergrowth particles account for a high proportion in the particle group of the sorted material.

[0014] Further, in step (1), the flotation reagents include a pH adjuster, carboxymethyl cellulose as a gangue mineral inhibitor, lead nitrate as an ilmenite activator, a combination of benzoyl hydroxamic acid and sodium oleate as an ilmenite collector, and frother #2 oil.

[0015] Further, in step (1), the pH of the ilmenite roughing slurry is 7.5-8.0, and 60-90g of carboxymethyl cellulose, 150-250g of lead nitrate, 800-1000g of a combined collector of benzoyl oxime acid and sodium oleate, and 20-40g of No. 2 oil are added per ton of flotation ore.

[0016] Further, in step (1), the pH of the ilmenite scavenging slurry is 7.5-8.0, and 100-150g of lead nitrate, 400-500g of a combined collector of benzoyl hydroxamic acid and sodium oleate, and 10-20g of No. 2 oil are added per ton of flotation ore.

[0017] Furthermore, in the combined collector of benzohydroxyxamic acid and sodium oleate, the mass ratio of benzohydroxyxamic acid to sodium oleate is 50:1.

[0018] Further, in step (2), the acid pretreatment involves adding sulfuric acid to treat the surface of the ilmenite flotation concentrate, adjusting the pH of the slurry to 1.0-2.0, setting the slurry stirring speed to 2.0-3.0 m / s, and stirring time to 20-30 min.

[0019] Furthermore, in step (2), solid-liquid separation is performed after acid pretreatment. The acid solution separated from the solid-liquid solution can be recycled during the pretreatment process, reducing the amount of sulfuric acid used and production costs. At the same time, solid-liquid separation can reduce the corrosion of the acid solution on subsequent process equipment.

[0020] Furthermore, in step (3), the strong magnetic separation process uses a vertical ring high gradient magnetic separator, which does not require the addition of reagents. It only uses strong magnetic field force to enhance the collection of ilmenite particles, ensuring the recovery rate of ilmenite concentrate.

[0021] Furthermore, the background magnetic induction intensity of the vertical ring high gradient magnetic separator is 0.8 to 1.0 T, and the medium is rod-shaped with a diameter of 1.0 or 1.5 mm.

[0022] Furthermore, in step (3), the TiO2 grade of the final ilmenite concentrate is 47.0-48.0%, and the recovery rate is 83.0-86.0%.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] (1) In the flotation process of ilmenite, heterogeneous agglomeration of ilmenite and gangue minerals is easily formed. It is often necessary to add a large amount of inhibitors and dispersants and increase the number of cleaning operations to obtain ilmenite concentrate with qualified grade. This will reduce the recovery rate of ilmenite. In this invention, acid pretreatment is used to add sulfuric acid to the ilmenite flotation concentrate for surface treatment, so that the ilmenite and gangue mineral particles that are easy to agglomerate are separated, the heterogeneous agglomeration of ilmenite and gangue mineral particles is weakened, and the homogeneous agglomeration of ilmenite particles is promoted. This can improve the recovery rate of ilmenite concentrate while ensuring grade. The pH value of the acid pretreatment pulp and the pulp mixing parameters will affect the acid pretreatment effect of the flotation concentrate.

[0025] (2) In the flotation process of ilmenite, due to the high density and heavy particles of ilmenite, it is easy to settle in the flotation tank during the flotation and cleaning process, resulting in a low recovery rate of ilmenite concentrate. In this invention, after acid pretreatment of flotation concentrate, a strong magnetic separation process is adopted. The advantage is that the strong magnetic field force acting directly on ilmenite strengthens its collection and improves the recovery rate of ilmenite.

[0026] (3) This invention significantly improves the efficiency of ilmenite beneficiation. High-grade and high-recovery ilmenite concentrate can be obtained by surface acid treatment of flotation rough concentrate followed by strong magnetic separation. The beneficiation process is short, the process structure and operation are simple, saving flotation reagents, reducing production costs and improving economic benefits. Attached Figure Description

[0027] Figure 1 This is a short process flow diagram of an embodiment of the present invention for enhanced ilmenite beneficiation;

[0028] Figure 2 This is a flow chart of the conventional flotation process of ilmenite, which is a comparative example of the process described in this invention, consisting of roughing, scavenging, and cleaning. Detailed Implementation

[0029] To better understand the present invention, the present invention will be described more fully and in detail below with reference to the embodiments and the accompanying drawings, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0030] Example 1

[0031] A short-process technology for enhanced separation of ilmenite, the process flow is as follows: Figure 1 As shown. The fineness of the flotation ilmenite material is -0.075mm, accounting for 80%. The TiO2 grade of the ore sample is 17.12%. The useful mineral is ilmenite, and the main gangue minerals are pyroxene, feldspar, chlorite, and sphene. The specific process steps include the following:

[0032] (1) Ilmenite flotation

[0033] The ilmenite feedstock is mixed with water to prepare a slurry with a mass concentration of 35%, and then subjected to ilmenite flotation. The flotation process includes one roughing operation and one scavenging operation. The pH value of the ilmenite roughing slurry is 7.5, the dosage of carboxymethyl cellulose is 90 g / t, the dosage of lead nitrate is 250 g / t, the dosage of the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is 1000 g / t, and the dosage of No. 2 oil is 20 g / t. The pH value of the ilmenite flotation scavenging slurry is 7.5, the dosage of lead nitrate is 150 g / t, the dosage of the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is 500 g / t, and the dosage of No. 2 oil is 10 g / t. The roughing concentrate is the ilmenite flotation concentrate, and the scavenging tailings are the flotation tailings. The scavenging concentrate is returned to the ilmenite roughing operation.

[0034] (2) Acid pretreatment of ilmenite flotation concentrate

[0035] The ilmenite flotation concentrate was subjected to acid pretreatment. The pH value of the acid pretreatment slurry was 1.0, the stirring speed was 2.5 m / s, and the stirring time was 20 min. After acid pretreatment, solid-liquid separation was performed to obtain ilmenite acid pretreated concentrate.

[0036] (3) High-intensity magnetic separation of ilmenite acid pretreated concentrate

[0037] High-gradient magnetic separation is performed on the acid pretreated concentrate of ilmenite. The high-gradient magnetic separation process is a single roughing operation. The high-gradient magnetic separation process adopts a vertical ring high-gradient magnetic separator with a background magnetic induction intensity of 1.0T. The medium is a bar-shaped material with a diameter of 1.5mm. The roughing concentrate is the final concentrate of ilmenite, and the tailings are returned to the flotation roughing operation as middlings.

[0038] Comparative Example 1

[0039] The flowchart of this comparison is as follows: Figure 2 As shown, the feed material is the same as in Example 1. The difference is that in step (1), the flotation process is one roughing, one scavenging and four cleaning, with the middlings returned in sequence. The reagent addition system for the one roughing and one scavenging is the same as in Example 1. Carboxymethyl cellulose 30g / t is added for the first cleaning, 20g / t for the second cleaning, 30g / t for the third cleaning, 50g / t for lead nitrate, and 100g / t for the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1). Carboxymethyl cellulose 20g / t is added for the fourth cleaning.

[0040] The separation results of Example 1 and Comparative Example 1 are shown in Table 1. This example can obtain separation indicators of TiO2 grade of final ilmenite concentrate of 47.15% and recovery rate of 83.50%, which is 0.65 percentage points higher than the TiO2 grade of titanium concentrate of the comparative example of conventional flotation and 14.73 percentage points higher than that of conventional flotation.

[0041] Table 1 shows the sorting results of Example 1 and Comparative Example 1.

[0042]

[0043] Table 1

[0044] Example 2

[0045] A short-process technology for enhanced separation of ilmenite, the process flow is as follows: Figure 1 As shown. The fineness of the flotation ilmenite material is -0.075mm, accounting for 85%; the TiO2 grade of the ore sample is 18.54%; the useful mineral is ilmenite; and the main gangue minerals are pyroxene, feldspar, chlorite, and sphene. The specific process steps include the following:

[0046] (1) Ilmenite flotation

[0047] The ilmenite material to be floated is mixed with water to prepare a slurry with a mass concentration of 35%, and then subjected to the ilmenite flotation process. The flotation process includes one roughing operation and one scavenging operation. The pH value of the ilmenite roughing slurry is 8.0, the dosage of carboxymethyl cellulose is 80 g / t, the dosage of lead nitrate is 200 g / t, the dosage of the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is 900 g / t, and the dosage of No. 2 oil is 30 g / t. The pH value of the ilmenite flotation scavenging slurry is 8.0, the dosage of lead nitrate is 100 g / t, the dosage of the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is 450 g / t, and the dosage of No. 2 oil is 15 g / t. The roughing concentrate is the ilmenite flotation concentrate, and the scavenging tailings are the flotation tailings. The scavenging concentrate is returned to the ilmenite roughing operation.

[0048] (2) Acid pretreatment of ilmenite flotation concentrate

[0049] The ilmenite flotation concentrate was subjected to acid pretreatment. The pH value of the acid pretreatment slurry was 1.5, the stirring speed was 3.0 m / s, and the stirring time was 20 min. After acid pretreatment, solid-liquid separation was performed to obtain ilmenite acid pretreated concentrate.

[0050] (3) High-intensity magnetic separation of ilmenite acid pretreated concentrate

[0051] High-gradient magnetic separation is performed on the acid pretreated concentrate of ilmenite. The high-gradient magnetic separation process is a single roughing operation. The high-gradient magnetic separation process adopts a vertical ring high-gradient magnetic separator with a background magnetic induction intensity of 1.0T. The medium is a bar-shaped material with a diameter of 1.5mm. The roughing concentrate is the final concentrate of ilmenite, and the tailings are returned to the flotation roughing operation as middlings.

[0052] Comparative Example 2

[0053] The flowchart of this comparison is as follows: Figure 2As shown, the feed material is the same as in Example 2. The difference is that the flotation process in step (1) is one roughing, one scavenging and four cleaning, with the middlings returned in sequence. The reagent addition system for the one roughing and one scavenging is the same as in Example 2. Carboxymethyl cellulose 30g / t is added for the first cleaning, 20g / t for the second cleaning, 30g / t for the third cleaning, 50g / t for lead nitrate, 100g / t for the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1), and 20g / t for the fourth cleaning.

[0054] The separation results of Example 2 and Comparative Example 2 are shown in Table 2. This example can obtain separation indicators with a final TiO2 grade of 47.43% and a recovery rate of 84.29% for ilmenite concentrate. This is 0.40 percentage points higher than the TiO2 grade of the titanium concentrate in the comparative example of conventional flotation and 15.11 percentage points higher than that of conventional flotation.

[0055] Table 2 shows the sorting results of Example 2 and Comparative Example 2.

[0056]

[0057]

[0058] Table 2

[0059] Example 3

[0060] A short-process technology for enhanced separation of ilmenite, the process flow is as follows: Figure 1 As shown. The fineness of the flotation ilmenite material is -0.075mm, accounting for 90%. The TiO2 grade of the ore sample is 21.18%. The useful mineral is ilmenite, and the main gangue minerals are pyroxene, feldspar, chlorite, and sphene. The specific process steps include the following:

[0061] (1) Ilmenite flotation

[0062] The ilmenite material to be floated is mixed with water to prepare a slurry with a mass concentration of 35%, and then subjected to the ilmenite flotation process. The flotation process includes one roughing operation and one scavenging operation. The pH value of the ilmenite roughing slurry is 8.0, the dosage of carboxymethyl cellulose is 60 g / t, the dosage of lead nitrate is 150 g / t, the dosage of the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is 800 g / t, and the dosage of No. 2 oil is 20 g / t. The pH value of the ilmenite flotation scavenging slurry is 8.0, the dosage of lead nitrate is 100 g / t, the dosage of the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is 400 g / t, and the dosage of No. 2 oil is 10 g / t. The roughing concentrate is the ilmenite flotation concentrate, and the scavenging tailings are the flotation tailings. The scavenging concentrate is returned to the ilmenite roughing operation.

[0063] (2) Acid pretreatment of ilmenite flotation concentrate

[0064] The ilmenite flotation concentrate was subjected to acid pretreatment. The pH value of the acid pretreatment slurry was 2.0, the stirring speed was 2.0 m / s, and the stirring time was 30 min. After acid pretreatment, solid-liquid separation was performed to obtain ilmenite acid pretreated concentrate.

[0065] (3) High-intensity magnetic separation of ilmenite acid pretreated concentrate

[0066] High-gradient magnetic separation is performed on the acid pretreated concentrate of ilmenite. The high-gradient magnetic separation process is a single roughing operation. The high-gradient magnetic separation process adopts a vertical ring high-gradient magnetic separator with a background magnetic induction intensity of 0.8T. The medium is bar-shaped with a diameter of 1.0mm. The roughing concentrate is the final concentrate of ilmenite, and the tailings are returned to the flotation roughing operation as middlings.

[0067] Comparative Example 3

[0068] The flowchart of this comparison is as follows: Figure 2 As shown, the feed material is the same as in Example 3. The difference is that the flotation process in step (1) is one roughing, one scavenging and four cleaning, with the middlings returned in sequence. The reagent addition system for the one roughing and one scavenging is the same as in Example 3. 20g / t of carboxymethyl cellulose is added for the first cleaning, 10g / t of carboxymethyl cellulose is added for the second cleaning, 20g / t of carboxymethyl cellulose and 50g / t of lead nitrate are added for the third cleaning, and 100g / t of a combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is added for the fourth cleaning. 20g / t of carboxymethyl cellulose is added for the fourth cleaning.

[0069] The separation results of Example 3 and Comparative Example 3 are shown in Table 3. This example can obtain separation indicators with a final TiO2 grade of 47.78% and a recovery rate of 85.86% for ilmenite concentrate. This is 0.26 percentage points higher than the TiO2 grade of the titanium concentrate in the comparative example of conventional flotation and 15.43 percentage points higher than that of conventional flotation.

[0070] Table 3 shows the sorting results of Example 3 and Comparative Example 3.

[0071]

[0072]

[0073] Table 3

[0074] Example 4

[0075] A short-process technology for enhanced separation of ilmenite, the process flow is as follows: Figure 1 As shown. The fineness of the flotation ilmenite material was -0.075mm, accounting for 86%, and the TiO2 grade of the ore sample was 17.86%. The useful mineral was ilmenite, and the main gangue minerals were pyroxene, feldspar, chlorite, and sphene. The specific process steps included are as follows:

[0076] (1) Ilmenite flotation

[0077] The ilmenite feedstock is mixed with water to prepare a slurry with a mass concentration of 40%, and then subjected to ilmenite flotation. The flotation process includes one roughing operation and one scavenging operation. The pH value of the ilmenite roughing slurry is 8.0, the dosage of carboxymethyl cellulose is 80 g / t, the dosage of lead nitrate is 250 g / t, the dosage of the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is 1000 g / t, and the dosage of No. 2 oil is 20 g / t. The pH value of the ilmenite flotation scavenging slurry is 8.0, the dosage of lead nitrate is 150 g / t, the dosage of the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is 500 g / t, and the dosage of No. 2 oil is 10 g / t. The roughing concentrate is the ilmenite flotation concentrate, and the scavenging tailings are the flotation tailings. The scavenging concentrate is returned to the ilmenite roughing operation.

[0078] (2) Acid pretreatment of ilmenite flotation concentrate

[0079] The ilmenite flotation concentrate was subjected to acid pretreatment. The pH value of the acid pretreatment slurry was 1.5, the stirring speed was 2.0 m / s, and the stirring time was 30 min. After acid pretreatment, solid-liquid separation was performed to obtain ilmenite acid pretreated concentrate.

[0080] (3) High-intensity magnetic separation of ilmenite acid pretreated concentrate

[0081] High-gradient magnetic separation is performed on the acid pretreated concentrate of ilmenite. The high-gradient magnetic separation process is a single roughing operation. The high-gradient magnetic separation process adopts a vertical ring high-gradient magnetic separator with a background magnetic induction intensity of 1.0T. The medium is bar-shaped with a diameter of 1.0mm. The roughing concentrate is the final concentrate of ilmenite, and the tailings are returned to the flotation roughing operation as middlings.

[0082] This embodiment can achieve a final TiO2 grade of 47.28% and a recovery rate of 83.87% in the ilmenite concentrate.

[0083] Example 5

[0084] A short-process technology for enhanced separation of ilmenite, the process flow is as follows: Figure 1 As shown. The fineness of the flotation ilmenite material was -0.075mm, accounting for 88%; the TiO2 grade of the ore sample was 19.23%; the useful mineral was ilmenite; and the main gangue minerals were pyroxene, feldspar, chlorite, and sphene. The specific process steps included are as follows:

[0085] (1) Ilmenite flotation

[0086] The ilmenite material to be floated is mixed with water to prepare a slurry with a mass concentration of 40%, and then subjected to the ilmenite flotation process. The flotation process includes one roughing operation and one scavenging operation. The pH value of the ilmenite roughing slurry is 7.5, the dosage of carboxymethyl cellulose is 70 g / t, the dosage of lead nitrate is 200 g / t, the dosage of the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is 900 g / t, and the dosage of No. 2 oil is 30 g / t. The pH value of the ilmenite flotation scavenging slurry is 7.5, the dosage of lead nitrate is 100 g / t, the dosage of the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is 450 g / t, and the dosage of No. 2 oil is 15 g / t. The roughing concentrate is the ilmenite flotation concentrate, and the scavenging tailings are the flotation tailings. The scavenging concentrate is returned to the ilmenite roughing operation.

[0087] (2) Acid pretreatment of ilmenite flotation concentrate

[0088] The ilmenite flotation concentrate was subjected to acid pretreatment. The pH value of the acid pretreatment slurry was 2.0, the stirring speed was 3.0 m / s, and the stirring time was 30 min. After acid pretreatment, solid-liquid separation was performed to obtain ilmenite acid pretreated concentrate.

[0089] (3) High-intensity magnetic separation of ilmenite acid pretreated concentrate

[0090] High-gradient magnetic separation is performed on the acid pretreated concentrate of ilmenite. The high-gradient magnetic separation process is a single roughing operation. The high-gradient magnetic separation process adopts a vertical ring high-gradient magnetic separator with a background magnetic induction intensity of 1.0T. The medium is bar-shaped with a diameter of 1.0mm. The roughing concentrate is the final concentrate of ilmenite, and the tailings are returned to the flotation roughing operation as middlings.

[0091] This embodiment can achieve a final TiO2 grade of 47.54% and a recovery rate of 84.96% in the ilmenite concentrate.

[0092] Example 6

[0093] A short-process technology for enhanced separation of ilmenite, the process flow is as follows: Figure 1 As shown. The fineness of the flotation ilmenite material was -0.075mm, accounting for 93%; the TiO2 grade of the ore sample was 20.58%; the useful mineral was ilmenite; and the main gangue minerals were pyroxene, feldspar, chlorite, and sphene. The specific process steps included are as follows:

[0094] (1) Ilmenite flotation

[0095] The ilmenite material to be floated is mixed with water to prepare a slurry with a mass concentration of 40%, and then subjected to the ilmenite flotation process. The flotation process includes one roughing operation and one scavenging operation. The pH value of the ilmenite roughing slurry is 8.0, the dosage of carboxymethyl cellulose is 70 g / t, the dosage of lead nitrate is 200 g / t, the dosage of the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is 900 g / t, and the dosage of No. 2 oil is 30 g / t. The pH value of the ilmenite flotation scavenging slurry is 8.0, the dosage of lead nitrate is 100 g / t, the dosage of the combined collector of benzoyl hydroxyxamic acid and sodium oleate (mass ratio 50:1) is 450 g / t, and the dosage of No. 2 oil is 15 g / t. The roughing concentrate is the ilmenite flotation concentrate, and the scavenging tailings are the flotation tailings. The scavenging concentrate is returned to the ilmenite roughing operation.

[0096] (2) Acid pretreatment of ilmenite flotation concentrate

[0097] The ilmenite flotation concentrate was subjected to acid pretreatment. The pH value of the acid pretreatment slurry was 1.5, the stirring speed was 2.5 m / s, and the stirring time was 20 min. After acid pretreatment, solid-liquid separation was performed to obtain ilmenite acid pretreated concentrate.

[0098] (3) High-intensity magnetic separation of ilmenite acid pretreated concentrate

[0099] High-gradient magnetic separation is performed on the acid pretreated concentrate of ilmenite. The high-gradient magnetic separation process is a single roughing operation. The high-gradient magnetic separation process adopts a vertical ring high-gradient magnetic separator with a background magnetic induction intensity of 1.0T. The medium is a bar-shaped material with a diameter of 1.5mm. The roughing concentrate is the final concentrate of ilmenite, and the tailings are returned to the flotation roughing operation as middlings.

[0100] This embodiment can achieve a final TiO2 grade of 47.72% and a recovery rate of 85.26% in the ilmenite concentrate.

Claims

1. A short-process technology for enhanced separation of ilmenite, characterized in that, The process includes the following steps: (1) Ilmenite flotation The ilmenite material to be floated is prepared into a slurry with a mass concentration of 30-40%, and flotation reagents are added to carry out the ilmenite flotation process. The flotation process includes one roughing operation and one scavenging operation. The roughing concentrate is the ilmenite flotation concentrate, the scavenging tailings are the flotation tailings, and the scavenging concentrate is returned to the ilmenite roughing operation. (2) Acid pretreatment of ilmenite flotation concentrate The ilmenite flotation concentrate is subjected to acid pretreatment, followed by solid-liquid separation to obtain ilmenite acid pretreated concentrate. (3) High-intensity magnetic separation of ilmenite acid pretreated concentrate The acid pretreated concentrate of ilmenite is subjected to a high gradient strong magnetic separation process, which includes a roughing operation. The roughing concentrate is the final concentrate of ilmenite, and the tailings are returned as middlings to the flotation roughing operation in step (1).

2. The short-process technology for enhanced ilmenite separation according to claim 1, characterized in that, In step (1), the particle size of the floating ilmenite material is more than 80% -0.075mm.

3. The short-process technology for enhanced ilmenite separation according to claim 1, characterized in that, In step (1), the flotation reagents include pH adjuster, gangue mineral inhibitor carboxymethyl cellulose, ilmenite activator lead nitrate, ilmenite collector benzoyl hydroxamic acid and sodium oleate combined collector, and foaming agent No. 2 oil.

4. The short-process technology for enhanced ilmenite separation according to claim 1, characterized in that, In step (1), the pH of the ilmenite roughing slurry is 7.5-8.0, and 60-90g of carboxymethyl cellulose, 150-250g of lead nitrate, 800-1000g of a combined collector of benzoyl oxime acid and sodium oleate, and 20-40g of No. 2 oil are added per ton of flotation ore.

5. The short-process technology for enhanced ilmenite separation according to claim 1, characterized in that, In step (1), the pH of the ilmenite scavenging slurry is 7.5-8.0, and 100-150g of lead nitrate, 400-500g of a combined collector of benzoyl hydroxamic acid and sodium oleate, and 10-20g of No. 2 oil are added per ton of flotation ore.

6. The short-process technology for enhanced ilmenite separation according to claim 5, characterized in that, In the combined collector of benzohydroxyxamic acid and sodium oleate, the mass ratio of benzohydroxyxamic acid to sodium oleate is 50:

1.

7. The short-process technology for enhanced ilmenite separation according to claim 1, characterized in that, In step (2), the acid pretreatment involves adding sulfuric acid to treat the surface of the ilmenite flotation concentrate, adjusting the pH of the slurry to 1.0-2.0, setting the slurry stirring speed to 2.0-3.0 m / s, and stirring time to 20-30 min.

8. The short-process technology for enhanced ilmenite separation according to claim 1, characterized in that, In step (3), the high gradient magnetic separation process uses a vertical ring high gradient magnetic separator, which does not require the addition of reagents.

9. The short-process technology for enhanced ilmenite separation according to claim 8, characterized in that, The background magnetic induction intensity of the vertical ring high gradient magnetic separator is 0.8 to 1.0 T, and the medium is rod-shaped with a diameter of 1.0 or 1.5 mm.

10. The short-process technology for enhanced ilmenite separation according to claim 1, characterized in that, In step (3), the TiO2 grade of the final ilmenite concentrate is 47.0-48.0%, and the recovery rate is 83.0-86.0%.

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